The utility model discloses a case between flotation device is connected, including the box, the box is by locating its between inside between case partitions are divided into left side between case and right side case two parts, and the lateral wall department of case has offered into thick liquid mouth between its right -of -center in political views between, and the case advances the thick liquid mouthful exit linkage with last process flotation device through this, be equipped with on the separator for container between the left case within a definite time and the right side between the case and starched the mouth, crossed thick liquid mouthful intercommunication through this between left and right the case, be equipped with the regulating plate that a size was greater than thick liquid mouthful size on crossing the thick liquid mouth, but the regulating plate is the structure that the oscilaltion was removed, the lateral wall department of case is equipped with a grout outlet between the left side between, case through this grout outlet after with together the import of process flotation device be connected. Through the utility model discloses be used as the transition mechanism between the flotation device, can obviously promote the whole index of plumbous flotation, reduce the selling loss of lead concentrate, can improve the rate of recovery of lead concentrate, increase plumbous amount of metal to can improve the lead concentrate contains the zinc volume.